However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.
From a career standpoint, the term âbiologistâ can have many meanings. As a biologist, you might study plants, animals, people or a particular environment. You could work in marine biology, wildlife biology or biochemistry, travel to the Brazilian rain forest to study biological compounds or work in a clinical laboratory as a microbiologist.
  There is no license or certification to become a marine biologist; usually a BS and/or MS degree in biology, specializing in marine science or marine biology, wiht the a â¦ ppropriate field experience, would suffice as credentials.There are several marine biology websites.o be a marine biologist you need to be really into science, maths and geography. I recommend this website: http://www.wisegeek.com/how-can-i-become-a-marine-biologist.htm.